.TH deductionguidesforstd::weak_ptr 3 "2024.06.10" "http://cppreference.com" "C++ Standard Libary"
.SH NAME
deductionguidesforstd::weak_ptr \- deductionguidesforstd::weak_ptr

.SH Synopsis
   Defined in header <memory>
   template< class T >                             \fI(since C++17)\fP
   weak_ptr( std::shared_ptr<T> ) -> weak_ptr<T>;

   One deduction guide is provided for std::weak_ptr to account for the edge case
   missed by the implicit deduction guides.

.SH Example


// Run this code

 #include <memory>

 int main()
 {
     auto p = std::make_shared<int>(42);
     std::weak_ptr w{p}; // explicit deduction guide is used in this case
 }
